--- /dev/null
+/*
+
+ silcos2net.c
+
+ Author: Pekka Riikonen <priikone@silcnet.org>
+
+ Copyright (C) 2002 Pekka Riikonen
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+*/
+/* $Id$ */
+
+#include "silcincludes.h"
+#include "silcnet.h"
+
+/* XXX TODO */
+
+#ifdef HAVE_IPV6
+#define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \
+ sizeof(so.sin6) : sizeof(so.sin))
+#else
+#define SIZEOF_SOCKADDR(so) (sizeof(so.sin))
+#endif
+
+typedef union {
+ struct sockaddr sa;
+ struct sockaddr_in sin;
+#ifdef HAVE_IPV6
+ struct sockaddr_in6 sin6;
+#endif
+} SilcSockaddr;
+
+static bool silc_net_set_sockaddr(SilcSockaddr *addr, const char *ip_addr,
+ int port)
+{
+ int len;
+
+ memset(addr, 0, sizeof(*addr));
+
+ /* Check for IPv4 and IPv6 addresses */
+ if (ip_addr) {
+ if (!silc_net_is_ip(ip_addr)) {
+ SILC_LOG_ERROR(("%s is not IP address", ip_addr));
+ return FALSE;
+ }
+
+ if (silc_net_is_ip4(ip_addr)) {
+ /* IPv4 address */
+ len = sizeof(addr->sin.sin_addr);
+ silc_net_addr2bin(ip_addr,
+ (unsigned char *)&addr->sin.sin_addr.s_addr, len);
+ addr->sin.sin_family = AF_INET;
+ addr->sin.sin_port = port ? htons(port) : 0;
+ } else {
+#ifdef HAVE_IPV6
+ /* IPv6 address */
+ len = sizeof(addr->sin6.sin6_addr);
+ silc_net_addr2bin(ip_addr,
+ (unsigned char *)&addr->sin6.sin6_addr, len);
+ addr->sin6.sin6_family = AF_INET6;
+ addr->sin6.sin6_port = port ? htons(port) : 0;
+#else
+ SILC_LOG_ERROR(("IPv6 support is not compiled in"));
+ return FALSE;
+#endif
+ }
+ } else {
+ /* Any address */
+ addr->sin.sin_family = AF_INET;
+ addr->sin.sin_addr.s_addr = INADDR_ANY;
+ if (port)
+ addr->sin.sin_port = htons(port);
+ }
+
+ return TRUE;
+}
+
+/* This function creates server or daemon or listener or what ever. This
+ does not fork a new process, it must be done by the caller if caller
+ wants to create a child process. This is used by the SILC server.
+ If argument `ip_addr' is NULL `any' address will be used. Returns
+ the created socket or -1 on error. */
+
+int silc_net_create_server(int port, const char *ip_addr)
+{
+ int sock, rval;
+ SilcSockaddr server;
+
+ SILC_LOG_DEBUG(("Creating a new server listener"));
+
+ /* Set sockaddr for server */
+ if (!silc_net_set_sockaddr(&server, ip_addr, port))
+ return -1;
+
+ /* Create the socket */
+ sock = socket(server.sin.sin_family, SOCK_STREAM, 0);
+ if (sock < 0) {
+ SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Set the socket options */
+ rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
+ if (rval < 0) {
+ SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Bind the server socket */
+ rval = bind(sock, &server.sa, SIZEOF_SOCKADDR(server));
+ if (rval < 0) {
+ SILC_LOG_DEBUG(("Cannot bind socket: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Specify that we are listenning */
+ rval = listen(sock, 5);
+ if (rval < 0) {
+ SILC_LOG_ERROR(("Cannot set socket listenning: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Set the server socket to non-blocking mode */
+ silc_net_set_socket_nonblock(sock);
+
+ SILC_LOG_DEBUG(("Server listener created, fd=%d", sock));
+
+ return sock;
+}
+
+/* Closes the server by closing the socket connection. */
+
+void silc_net_close_server(int sock)
+{
+ shutdown(sock, 2);
+ close(sock);
+
+ SILC_LOG_DEBUG(("Server socket closed"));
+}
+
+/* Creates a connection (TCP/IP) to a remote host. Returns the connection
+ socket or -1 on error. This blocks the process while trying to create
+ the connection. */
+
+int silc_net_create_connection(const char *local_ip, int port,
+ const char *host)
+{
+ int sock, rval;
+ char ip_addr[64];
+ SilcSockaddr desthost;
+
+ SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
+
+ /* Do host lookup */
+ if (!silc_net_gethostbyname(host, ip_addr, sizeof(ip_addr))) {
+ SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
+ "IP address", host));
+ return -1;
+ }
+
+ /* Set sockaddr for this connection */
+ if (!silc_net_set_sockaddr(&desthost, ip_addr, port))
+ return -1;
+
+ /* Create the connection socket */
+ sock = socket(desthost.sin.sin_family, SOCK_STREAM, 0);
+ if (sock < 0) {
+ SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Bind to the local address if provided */
+ if (local_ip) {
+ SilcSockaddr local;
+
+ /* Set sockaddr for local listener, and try to bind it. */
+ if (silc_net_set_sockaddr(&local, local_ip, 0))
+ bind(sock, &local.sa, sizeof(local));
+ }
+
+ /* Connect to the host */
+ rval = connect(sock, &desthost.sa, sizeof(desthost));
+ if (rval < 0) {
+ SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
+ shutdown(sock, 2);
+ close(sock);
+ return -1;
+ }
+
+ /* Set appropriate options */
+#if defined(TCP_NODELAY)
+ silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
+#endif
+ silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
+
+ SILC_LOG_DEBUG(("Connection created"));
+
+ return sock;
+}
+
+/* Creates a connection (TCP/IP) to a remote host. Returns the connection
+ socket or -1 on error. This creates non-blocking socket hence the
+ connection returns directly. To get the result of the connect() one
+ must select() the socket and read the result after it's ready. */
+
+int silc_net_create_connection_async(const char *local_ip, int port,
+ const char *host)
+{
+ int sock, rval;
+ char ip_addr[64];
+ SilcSockaddr desthost;
+
+ SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
+ host, port));
+
+ /* Do host lookup */
+ if (!silc_net_gethostbyname(host, ip_addr, sizeof(ip_addr))) {
+ SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
+ "IP address", host));
+ return -1;
+ }
+
+ /* Set sockaddr for this connection */
+ if (!silc_net_set_sockaddr(&desthost, ip_addr, port))
+ return -1;
+
+ /* Create the connection socket */
+ sock = socket(desthost.sin.sin_family, SOCK_STREAM, 0);
+ if (sock < 0) {
+ SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
+ return -1;
+ }
+
+ /* Bind to the local address if provided */
+ if (local_ip) {
+ SilcSockaddr local;
+
+ /* Set sockaddr for local listener, and try to bind it. */
+ if (silc_net_set_sockaddr(&local, local_ip, 0))
+ bind(sock, &local.sa, sizeof(local));
+ }
+
+ /* Set the socket to non-blocking mode */
+ silc_net_set_socket_nonblock(sock);
+
+ /* Connect to the host */
+ rval = connect(sock, &desthost.sa, sizeof(desthost));
+ if (rval < 0) {
+ if (errno != EINPROGRESS) {
+ SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
+ shutdown(sock, 2);
+ close(sock);
+ return -1;
+ }
+ }
+
+ /* Set appropriate options */
+#if defined(TCP_NODELAY)
+ silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
+#endif
+ silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
+
+ SILC_LOG_DEBUG(("Connection operation in progress"));
+
+ return sock;
+}
+
+/* Closes the connection by closing the socket connection. */
+
+void silc_net_close_connection(int sock)
+{
+ close(sock);
+}
+
+/* Set's the socket to non-blocking mode. */
+
+int silc_net_set_socket_nonblock(int sock)
+{
+ return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
+}
+
+/* Converts the IP number string from numbers-and-dots notation to
+ binary form. */
+
+bool silc_net_addr2bin(const char *addr, void *bin, uint32 bin_len)
+{
+ int ret = 0;
+
+ if (silc_net_is_ip4(addr)) {
+ /* IPv4 address */
+ struct in_addr tmp;
+ ret = inet_aton(addr, &tmp);
+ if (bin_len < 4)
+ return FALSE;
+
+ memcpy(bin, (unsigned char *)&tmp.s_addr, 4);
+#ifdef HAVE_IPV6
+ } else {
+ /* IPv6 address */
+ if (bin_len < 16)
+ return FALSE;
+
+ ret = inet_pton(AF_INET6, addr, &bin);
+#endif /* HAVE_IPV6 */
+ }
+
+ return ret != 0;
+}
projects / silc.git / blobdiff